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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da090d8e7a8aeddac63a8dd66904f05993918090d38b0fcc339f0e06f16bd8dc' 
  AND token = 'vMPSjHT0Reh4arieL6xknytV1zBJ0xBVBr3cYZli5U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}